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Summary
DescriptionSenator John Heinz History Center - IMG 7824.JPG
Exhibit in the Senator John Heinz History Center, 1212 Smallman Street, Pittsburgh, Pennsylvania, USA. There were no restrictions on photography in the museum collections. Thacher cylindrical slide rule, circa 1890; patented in 1881 by Edwin Thacher (1839-1920).
Date
Source
Self-photographed
Author
Daderot
Permission (Reusing this file)
Public domain.
Licensing
Public domainPublic domainfalsefalse
I, the copyright holder of this work, release this work into the public domain. This applies worldwide. In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.
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Items portrayed in this file
depicts
copyright status
copyrighted, dedicated to the public domain by copyright holder
copyright license
released into the public domain by the copyright holder
inception
2 December 2010
source of file
original creation by uploader
exposure time
0.01666666666666666666 second
f-number
2.8
focal length
4.6 millimetre
ISO speed
200
MIME type
image/jpeg
instance of
photograph
File history
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current
00:56, 12 December 2010
3,264 × 1,304 (1.31 MB)
Daderot
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